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- Luzula parviflora
Luzula parviflora — small-flowered wood rush
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Facts
Small-flowered wood rush is a circumboreal species, found in boreal and subalpine habitats in New England. Research has shown that seeds have great longevity in the soil, and may survive in the seed bank for centuries.
Habitat
Alpine or subalpine zones, anthropogenic (man-made or disturbed habitats), shores of rivers or lakes
New England distribution
Adapted from BONAP data
Native: indigenous.
Non-native: introduced (intentionally or unintentionally); has become naturalized.
County documented: documented to exist in the county by evidence (herbarium specimen, photograph). Also covers those considered historical (not seen in 20 years).
State documented: documented to exist in the state, but not documented to a county within the state. Also covers those considered historical (not seen in 20 years).
Note: when native and non-native populations both exist in a county, only native status is shown on the map.
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Characteristics
- Habitat
-
- terrestrial
- wetlands
- New England state
-
- Maine
- Massachusetts
- New Hampshire
- Vermont
- Stem shape in cross-section
- the stem is round or oval in cross-section
- Leaf blade width
- 3–10 mm
- Leaf blade cross-section
- the leaf blade is flat or rolled in at the edges
- Inflorescence position
- the inflorescence is at the tip of the plant
- Inflorescence branching
- the inflorescence is branched
- Fruit type (general)
- the fruit is a capsule, with at least three seeds in it
- Fruit length
- 2–2.7 mm
- Leaf position on plant
-
- some leaf attachment points are above the midpoint of the stem
- the attachment points of all the leaves are at or near the base of the plant
- Perianth composition
- the perianth is green or brown, with six sepal-like parts, and a leafy texture
- Fruit cross-section
- the fruit is triangular to terete (circular) in cross-section
-
Flowers
- Anther color (dry)
- the anthers range in color from white to tan or yellow to yellow-brown
- Floral bristle color
- NA
- Floral bristle number
- NA
- Floral bristle relative length
- NA
- Floral bristles
- NA
- Floral scale hairs
- NA
- Floral scale length
- 0 mm
- Floral scale nerves
- NA
- Flower number per cluster
-
- 1
- 2-5
- Inflorescence bract angle
- the bracts are vertical or angled only slightly outwards
- Inflorescence bract number
- there are two to five bracts per inflorescence
- Inflorescence bract position (Sparganium)
- NA
- Inflorescence bracts
- there are at least two bracts, and they are either flat or folded or rolled in at the edges
- Inflorescence branching
- the inflorescence is branched
- Inflorescence crowding
- the inflorescence is at least somewhat spread out, with at least one branch coming from the main stem
- Inflorescence position
- the inflorescence is at the tip of the plant
- Inflorescence shape
- the aggregations within the inflorescence are roughly circular (not flattened) in cross-section
- Inflorescence type
- there are two or more flowers, spikes or flower clusters on a branched inflorescence
- Perianth composition
- the perianth is green or brown, with six sepal-like parts, and a leafy texture
- Stamen number
- 4-6
- Stigma number
- 3
- Style division
- the top two thirds of the style is divided
- floral bristle barbs
- NA
-
Fruits or seeds
- Achene beak length
- 0 mm
- Achene surface texture
- NA
- Achene tubercle relative width
- NA
- Achene tubercle width
- 0 mm
- Capsule relative length
-
- the capsule is about equal to the perianth
- the capsule is longer thant he perianth
- Fruit cross-section
- the fruit is triangular to terete (circular) in cross-section
- Fruit length
- 2–2.7 mm
- Fruit type (general)
- the fruit is a capsule, with at least three seeds in it
- Fruit type (specific)
- the fruit is a capsule (splits along two or more seams, apical teeth or pores when dry, to release two or more seeds)
- Locules in capsule
- the capsule has one locule
- Seed length
- 1.1–1.5 mm
- Seed tail relative length
- 1.1–1.5 mm
- Seed tails
- there is no tail on the seeds
- Tubercle height
- 0 mm
-
Growth form
- Lifespan
- the plant lives more than two years
- Underground organs
- the plant has a rhizome (a horizontal underground stem with roots growing from it)
-
Leaves
- Auricle length
- 0 mm
- Auricle texture
- NA
- Auricles
- there are no auricles on the leaf sheath
- Leaf blade cross-section
- the leaf blade is flat or rolled in at the edges
- Leaf blade length
- 70–170 mm
- Leaf blade width
- 3–10 mm
- Leaf form
- all the leaves hold their form out of water
- Leaf position on plant
-
- some leaf attachment points are above the midpoint of the stem
- the attachment points of all the leaves are at or near the base of the plant
- Leaf septa
- the leaf blades do not have transverse septa
- Leaf sheath hairs
- the leaf sheathes have hairs on them
- Pedicel length (Typha)
- 0 mm
- Stem leaf blade ligules
- there are no ligules at the leaf blade bases
- Stem leaf blades
- there are fully-developed leaves with leaf blades on the main stem
- Width of seed-producing inflorescence
- 40–120 mm
-
Place
- Habitat
-
- terrestrial
- wetlands
- New England state
-
- Maine
- Massachusetts
- New Hampshire
- Vermont
- Specific habitat
-
- alpine or subalpine zones
- man-made or disturbed habitats
- shores of rivers or lakes
-
Stem, shoot, branch
- Plant height
- 20–100 cm
- Stem shape in cross-section
- the stem is round or oval in cross-section
Wetland status
Occurs in wetlands or non-wetlands. (Wetland indicator code: FAC)
In New England
Distribution
- Connecticut
- absent
- Maine
- present
- Massachusetts
- present
- New Hampshire
- present
- Rhode Island
- absent
- Vermont
- present
Conservation status
Exact status definitions can vary from state to state. For details, please check with your state.
- Vermont
- rare to uncommon (S-rank: S2S3)
ssp. melanocarpa
- Massachusetts
- extremely rare (S-rank: S1), endangered (code: E)
- New Hampshire
- uncommon (S-rank: S3), W (code: W)
Subspecies and varieties
Our subspecies is Luzula parviflora (Ehrh.) Desv. ssp. melanocarpa.
From Flora Novae Angliae dichotomous key
9. Luzula parviflora (Ehrh.) Desv. ssp. melanocarpa (Michx.) Hämet-Ahti N
small-flowered wood rush. Juncus melanocarpus Michx.; Luzula melanocarpa (Michx.) Desv.; L. parviflora (Ehrh.) Desv. var. melanocarpa (Michx.) Buch. • MA, ME, NH, VT. Stream shores, gullies, mossy areas, and trail sides in boreal and subalpine areas.
Native to North America?
Yes
Sometimes confused with
- Luzula acuminata:
- inflorescence with simple or once-forked branches and plants flowering in early through mid-spring (vs. L. parviflora, with the inflorescence with several-branched branches and plants flowering in late spring through summer).
- Luzula luzuloides:
- flowers in glomerules of 3-8 and anthers much longer than the associated filaments (vs. L. parviflora, with flowers solitary or paired and anthers equaling or shorter than the associated filaments).
Synonyms
- Juncus melanocarpus Michx.
- Luzula melanocarpa (Michx.) Desv.
- Luzula parviflora (Ehrh.) Desv. var. melanocarpa (Michx.) Buch.